In general, interhalogen compounds are more reactive than halogens (except fluorine). This is because $\mathrm{X}-{\mathrm{X}}^{\text{'}}$ bond in interhalogens is weaker than $\mathrm{X}-\mathrm{X}$ bond in halogens except $\mathrm{F}-\mathrm{F}$ bond. All these undergo hydrolysis giving halide ion derived from the smaller halogen and a hypohalite (when ${\mathrm{XX}}^{\text{'}}$), halite (when ${\mathrm{XX}}_3^{\text{'}}$), halate (when ${\mathrm{XX}}_5^{\text{'}}$) and perhalate (when$\left.{{\mathrm{XX}}_7}^{\text{'}}\right)$ anion derived from the larger halogen.

${\mathrm{XX}}^{\text{'}}+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{HX}}^{\text{'}}+\mathrm{HOX}$